When using multiple extensions (for instance the link types "is blocked by" and "blocks") it would help a lot to have a way of showing why an issue in question is extended. Allowing each extender to have a background color on the items it adds, or a symbol next to the summary would be great.
Example:
An automated structure that inserts "type=epic and project=projectA"
Extension 1: Extend with Linked Issues, type: Blocker, "is blocked by"
Extension 2: Extend with Linked Issues, type: Blocker, "blocks"

The extensions might be permanent or quick transformations. For each of them it would be nice if the configuration setup allowed for background color or a prefix in the summary column